Lemma
EasyCounting & chance
OpenStax, Algebra and Trigonometry 2e §13.7 Probability · Try It 5 · Probability · Counting & chance

Probability · Try It 5

Two number cubes are rolled. Use the Complement Rule to find the probability that the sum is less than 10.

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OpenStax, Algebra and Trigonometry 2e · §13.7 Probability · Try It 5

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Checked against the answer in OpenStax, Algebra and Trigonometry 2e.